词汇	Protection roof
释义	Protection roof 保护顶板
随便看	internal constant internal constitution Internal Constitution of the Stars internal constraint internal constrictor muscle of larynx internal construction internal construction engine internal constructive thought internal consultancy internal consultants internal consultation document internal consulting internal consumption internal consumption entry internal consumption entry slip internal contact internal contact potential difference internal container internal container for casks internal container for containers internal container for containers, casks internal contamination internal contavl internal content internal contention